How can I handle http requests of different methods to / in Go?
GoGo Problem Overview
I'm trying to figure out the best way to handle requests to /
and only /
in Go and handle different methods in different ways. Here's the best I've come up with:
package main
import (
"fmt"
"html"
"log"
"net/http"
)
func main() {
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
if r.URL.Path != "/" {
http.NotFound(w, r)
return
}
if r.Method == "GET" {
fmt.Fprintf(w, "GET, %q", html.EscapeString(r.URL.Path))
} else if r.Method == "POST" {
fmt.Fprintf(w, "POST, %q", html.EscapeString(r.URL.Path))
} else {
http.Error(w, "Invalid request method.", 405)
}
})
log.Fatal(http.ListenAndServe(":8080", nil))
}
Is this idiomatic Go? Is this the best I can do with the standard http lib? I'd much rather do something like http.HandleGet("/", handler)
as in express or Sinatra. Is there a good framework for writing simple REST services? web.go looks attractive but appears stagnant.
Thank you for your advice.
Go Solutions
Solution 1 - Go
To ensure that you only serve the root: You're doing the right thing. In some cases you would want to call the ServeHttp method of an http.FileServer object instead of calling NotFound; it depends whether you have miscellaneous files that you want to serve as well.
To handle different methods differently: Many of my HTTP handlers contain nothing but a switch statement like this:
switch r.Method {
case http.MethodGet:
// Serve the resource.
case http.MethodPost:
// Create a new record.
case http.MethodPut:
// Update an existing record.
case http.MethodDelete:
// Remove the record.
default:
http.Error(w, "Method not allowed", http.StatusMethodNotAllowed)
}
Of course, you may find that a third-party package like gorilla works better for you.
Solution 2 - Go
eh, I was actually heading to bed and thus the quick comment on looking at http://www.gorillatoolkit.org/pkg/mux which is really nice and does what you want, just give the docs a look over. For example
func main() {
r := mux.NewRouter()
r.HandleFunc("/", HomeHandler)
r.HandleFunc("/products", ProductsHandler)
r.HandleFunc("/articles", ArticlesHandler)
http.Handle("/", r)
}
and
r.HandleFunc("/products", ProductsHandler).
Host("www.domain.com").
Methods("GET").
Schemes("http")
and many other possibilities and ways to perform the above operations.
But I felt a need to address the other part of the question, "Is this the best I can do". If the std lib is a little too bare, a great resource to check out is here: https://github.com/golang/go/wiki/Projects#web-libraries (linked specifically to web libraries).